Contributor sharing question for Sharing to specified people

New Contributor

I have a user that is setup as a contributor for some Document Libraries.  Instead of asking the site owner to setup access for new users he is sharing all the top level folders in the document library  and allowing editing.  Now this could be something with the way that I have things configured but the person that is shared with can now add files and folders to the shared folder under that document library.  This user has rights listed as Limited Access but it seems that they are able to do as much as the contributor that originally shared the access to the new user.    Is there anything I can do to prevent this so that sharing from the document library only occurs from the site owner and not a member with contribute access?  

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